2 FreeRTOS.org V5.0.4 - Copyright (C) 2003-2008 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 ***************************************************************************
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29 * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
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30 * and even write all or part of your application on your behalf. *
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31 * See http://www.OpenRTOS.com for details of the services we provide to *
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32 * expedite your project. *
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34 ***************************************************************************
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35 ***************************************************************************
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37 Please ensure to read the configuration and relevant port sections of the
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38 online documentation.
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40 http://www.FreeRTOS.org - Documentation, latest information, license and
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43 http://www.SafeRTOS.com - A version that is certified for use in safety
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46 http://www.OpenRTOS.com - Commercial support, development, porting,
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47 licensing and training services.
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49 #include "FreeRTOS.h"
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52 #define isrCLEAR_EINT_1 2
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55 * Interrupt routine that simply wakes vButtonHandlerTask on each interrupt
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56 * generated by a push of the built in button. The wrapper takes care of
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57 * the ISR entry. This then calls the actual handler function to perform
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58 * the work. This work should not be done in the wrapper itself unless
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59 * you are absolutely sure that no stack space is used.
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61 void vButtonISRWrapper( void ) __attribute__ ((naked));
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62 void vButtonHandler( void );
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64 void vButtonHandler( void )
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66 extern xSemaphoreHandle xButtonSemaphore;
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67 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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69 xSemaphoreGiveFromISR( xButtonSemaphore, &xHigherPriorityTaskWoken );
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71 if( xHigherPriorityTaskWoken )
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73 /* We have woken a task. Calling "yield from ISR" here will ensure
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74 the interrupt returns to the woken task if it has a priority higher
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75 than the interrupted task. */
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76 portYIELD_FROM_ISR();
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79 EXTINT = isrCLEAR_EINT_1;
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82 /*-----------------------------------------------------------*/
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84 void vButtonISRWrapper( void )
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86 /* Save the context of the interrupted task. */
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89 /* Call the handler to do the work. This must be a separate function to
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90 the wrapper to ensure the correct stack frame is set up. */
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93 /* Restore the context of whichever task is going to run once the interrupt
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95 portRESTORE_CONTEXT();
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